Primary Ecomaths


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Did you know that maths can help us protect our planet?

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Maths can help us recycle old rubbish to make new things.

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Maths can help us save energy in our homes and schools.

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Maths can even help us grow our own food and much, much more.

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Hiya, I'm Stef

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and I'm going to show you how to get beautiful food like this

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all the way from these fields onto your plate, using maths.

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But this isn't any old maths,

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this is the kind of maths that helps us to look to after the environment.

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And I call it Ecomaths.

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These fields belong to Wash Farm in Devon,

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where they use maths to work out the most environmentally friendly way

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to get food to our plates.

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This is Ed and I want to find out what he's picking.

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Hi, there, Ed, what are you up to?

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Hi, there, Stef. I'm picking spring greens.

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Look at that. That's absolutely beautiful.

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What journey is this handful of greens going to make

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from here until it gets onto my plate?

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Well, once we've picked it in the field,

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we'll take it back to the farm where it'll get stored,

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probably, just over night.

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After that, it'll get packed into a bag and into a box

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and then, it gets delivered locally to our customers.

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Can you take me to where this goes next? Yeah, certainly.

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So, our food journey starts in the field.

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The next stop is just a few minutes tractor ride to the farm itself,

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where I meet James.

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So, I've just come back from your fields.

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What happens in here?

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This is where we will weigh the product

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when it arrives into our packhouse, then put it into a fridge

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to store it, we then move it to our packing lines,

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so we're putting it into bags or into a box,

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before going onto our lorries.

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Every stage in the journey uses energy.

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This store is like a giant fridge that uses electricity.

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Here is the packing line for the spring greens.

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The spring greens are being put into bags,

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each one weighs about 400g.

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What else comes from the local fields?

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Well, believe it or not, even in the middle of winter,

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the farm grows salad leaves.

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This polytunnel is like a massive tent

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to protect the plants from the harsh winter weather.

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This is called Claytonia.

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It's really succulent. Mmm. And why'd do use this one?

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We use this one because it counterbalances

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some of the other more strong flavours.

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So, a very mild flavour, isn't it?

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so it can grow more leaves again.

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There's maths everywhere you look.

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This is Golden Mustard.

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These are all planted by hand and they're planted 15cm apart.

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And why does it need to be 15cm?

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Why can't you just pack loads of them in?

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It needs a certain amount of air and ventilation to help it grow well.

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If you planted them much closer together,

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you'd probably only get the same amount growing.

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It's just, instead of having three large ones like we have here,

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we'd have six very small ones. What else goes into the salad?

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This is Rainbow Chard.

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And this is dandelion.

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Golden Streak Mustard.

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And just break it all up.

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These crates of salad leaves have just arrived at Wash Farm

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to be mixed.

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Rainbow Chard.

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And then, Dan, if you want to grab the dandelion leaves.

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To make the salad, they mix two crates of dandelion,

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two crates of Mustard, four crates of Claytonia

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and one of Rainbow Chard.

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Can you tell the difference by looking at them?

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You would if you tasted them. Delicious!

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After mixing the salad, they weigh out the mixture

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and pack it into bags, using this machine.

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At this time of year, Wash Farm can't grow everything

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that its customers want.

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So, some things come from far away, like these lemons.

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The next stage is to make up a big fruit and veg box.

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Hi, Lena, can I give you a hand? Hello. Yeah, you can.

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How do I do it? First thing, gloves. Ooh, attractive(!) Yeah.

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And I will give you a job to do spring greens. OK.

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Bag, you just, when you take, fold

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and squeeze on this box which is very full this week.

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So, it's 400 grams of spring greens? Spring greens, yes.

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There are ten items in the box, most are local fruit and veg,

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but some have come from far away. Can you guess which is which?

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cos if one person goes a bit slowly, everyone else has to stop.

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Some of the boxes get sent to other parts of the country on big trucks.

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It's a bit of the journey that uses fuel,

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so they try to make sure the trucks are packed as full as possible.

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Next morning, the local delivery vans arrive

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and the final stage of the journey begins.

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First, each order's checked,

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then the boxes are packed tightly into the van.

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The vans go from home to home,

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using the shortest possible route to save fuel.

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It's taken just two days

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from the time that David placed the order online

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to the delivery on his doorstep.

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All right. See you next week, thanks very much, bye. Bye.

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I know somewhere where this challenge

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of growing food as close as possible to where it's eaten

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is taken even further.

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Put both feet on it.

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Arrrgh. Argh.

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That's it. Right, OK.

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At Ashley Primary School in Surrey, these children grow their own veg

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in the school vegetable garden. And now, they're digging them up.

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It's just a short walk from the garden to the kitchen.

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We brought some leeks from the garden.

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Lovely, thank you very much. I'll get those washed.

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I want to find out about this brilliant school and its garden.

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And what better place to start than the dining hall.

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Max, where are the leeks that you picked from the garden?

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In the curry, cos we grow loads of our own vegetables.

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Do you grow a lot of the vegetables that you end up eating?

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We grow quite a lot of the food we eat.

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This tastes fantastic.

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I think it tastes even better knowing that the vegetables

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have just walked over the garden, over the football pitch, to here.

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Those leeks taste so nice in the curry. Cool, isn't it?

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Nothing is wasted.

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The leftovers and waste from the kitchen feeds the chickens

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and goes into the compost to feed the next crop of vegetables.

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The children are measuring out the ground

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and planting onions 20cm apart.

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180.

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Yes, I got the last one! 200. 200!

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Why is it so important to space them perfectly, like this?

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To obtain the maximum yield from the area that you're planting in

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and also, just to make it easier to weed, basically.

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So, how much do they save by using their own, very local food?

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How much fruit and veg do you use each week?

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We get through an average of four crates of fruit and veg a week.

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How much do you think you'd save?

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We could save at least two crates from the garden each week, I think.

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How much energy are we saving, now we're getting it from the garden?

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I'm not sure on how much energy,

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but if we're going from four crates being transported in,

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to two crates from our garden,

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how much do you think that would be?

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That would be about half. That's right

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Good, that would be good. Yeah, that'd be very good. Very good.

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They've just planted an orchard of apple trees.

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It's a perfect rectangle, four-trees wide and six-trees long.

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Can you count them for me?

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ALL: 4!

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Aaaand...

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8!

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And...

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12!

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And...

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16!

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And...

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20!

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And...

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24!

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Yeah!

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Well, I've had a brilliant time here, learning all about growing

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and planting your own, local varieties of fruit and veg

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and using Ecomaths to help.

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But, don't worry if you don't have a massive area like this,

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you can still grow lots and lots of veg in a small tub

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in your garden and you'll have delicious, local food

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that won't cost the Earth and tastes absolutely fantastic.

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Did you know that maths can help us protect our planet?

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Maths can help us recycle old rubbish to make new things.

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Maths can help us save energy in our homes and schools.

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Maths can even help us grow our own food and much, much more.

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Hiya, I'm Stefan, and I'm going to show you how to turn this...

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into this.

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Using maths.

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But this isn't any old maths, oh, no,

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this is what I call Ecomaths,

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and it's a brilliant way to understand the world we live in

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and to help make it a better place.

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And the amazing thing about Ecomaths is it's everywhere around us,

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it's even lurking in your rubbish bin.

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How cool is this?

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How many shapes can you see in this enormous mound of rubbish?

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The first thing we need to do is sort this big mess out.

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And that's what this place is for.

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They sort it all into different shapes

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that we find in the world around us.

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So, here I am, actually, sorting some of this rubbish out.

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I've got Richard with me,

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he's going to explain how they use Ecomaths

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to sort all this stuff. Richard, what is this amazing place?

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This is a Materials Recycling Facility, a MRF.

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We call it a Merf. A Merf! I love that. And what does a Merf do?

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We take in all different types of packaging, newspapers, old bottles,

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cans, things people don't want anymore,

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split it all up and then re-use it.

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We use the different machines to separate by the shape

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of the material and the weight of the material.

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So, the first thing that it comes to is a screen with rotating discs,

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which allows paper to go over the top, cos it's thin and light

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and cans and bottles to fall through,

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because they're heavy and round.

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So, here I am, right in the middle of this massive place,

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and I'm going to find out how well it sorts my rubbish.

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We'll start off with my big cylinder, the bottle.

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Let's see how it goes.

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Ah! Straight through!

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Now, for something a bit smaller.

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Another cylinder, my aluminium drinks can.

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Let's see what happens.

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Ha-ha!

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Straight through, it didn't even touch the sides!

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So, now, time for a very different shape, a piece of paper.

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"Don't throw me away."

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But this is very wide, but it's very, very thin.

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Let's see what happens to it.

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Ah!

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I've been recycled!

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Now, time for the big fella, the cardboard box.

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The big cube, let's see where it goes.

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Oooh, it's not sure. Spinning around!

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Right up the top.

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It's sorted all of my recycling perfectly.

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Imagine I am a plastic bottle. I've been chucked in the recycling

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and I'm there with all my mates, all the paper and the rubbish.

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What's my journey?

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First thing that will happen, is you'll go over the screen,

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the sieve, and you'll fall through the holes in the sieve,

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cos you're small and thin.

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And then, you'll go along a conveyor belt,

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where a robot will look at you and see what colour you are.

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Depending what colour you are, it'll push you into a different bin

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with a jet of air.

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Then, you'll come into here and people will check

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there's no paper with you and make sure you go into the plastic bin.

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From there, you go into the giant baler,

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which squeezes all the plastic bottles,

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takes all the air outside, so they become thin

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and then we can put them into a bale, about one metre by one metre,

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and then, they easily fit onto vehicles.

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Woo-hoo!

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And here we are, the Merf has finished its work

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and turned all of that rubbish into these.

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And this is a beautiful bale of plastic.

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It's taken these shapes, these big, wide shapes,

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and squashed them really, really flat.

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And it's made a brand new shape out of it.

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This is a huge cuboid made out of bottles all squished together.

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Over here, is another big bale, completely made of aluminium cans,

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it's beautiful!

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And this one is another bale, all made out of cardboard.

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They're all the same shape and the same size,

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but they're slightly different weights.

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The metal and the plastic are heavier than the cardboard.

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And now, all of this can go off to be made into brand new things.

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So, the cardboard can be used to make brand new cardboard boxes.

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The aluminium cans can go off to make aluminium cans.

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And the plastic, I think, is the coolest one of all.

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The plastic can be taken off to be made

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into brand new plastic bottles,

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but if you're really clever and really cool,

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you can make it into one of these.

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A recycled plastic chair. Look at that!

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What would happen if we didn't recycle this stuff?

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Where would it go?

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This type of material would just go in your normal bin

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with your food and other things and go in a hole in the ground.

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But most types of paper, plastic, metal and glass,

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which is what comes in here, can be recycled pretty well.

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What's the most bizarre thing you've ever had come through here?

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In one of our facilities, we once had a live boa constrictor snake.

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It was this thick. Ha-ha! A live snake!

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You really do need the gloves, then? Yeah, you need the gloves.

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We can all do our own rubbish sorting,

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like at this Eco-School in Peckham.

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Ready, goooo!

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What a mess!

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What sort of bottles are really good to use?

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Two-litre bottles like this. Two-litre bottles.

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They're doing the same job as the machines did

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at the recycling plant.

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Sorting out plastic bottles into different shapes and sizes.

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So, guys, are these ones any good? No. No? Why's that?

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Cos they're too small. Too small, OK.

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OK, that seems pretty good, let's put a few more up here.

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Ooh, look, this is looking brilliant.

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Right here.

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Going that way round.

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Nine.

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Ten.

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So, OK, has everyone got ten in their bag? Yes.

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Exactly ten in their bag? Yeah.

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Guys, are we ready to count? Yeah!

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OK. One, two, three. Go!

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ALL: Ten.

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20.

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30.

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40.

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50. 60.

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70.

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80.

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90.

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Brilliant! Well done, everybody!

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But what are they going to use them for?

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Let's take a look.

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Have you got enough bottles here? Do you want another one?

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There you go, there's one more.

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By using Ecomaths

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to sort out our rubbish into different shapes and sizes,

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we can re-use things like water bottles

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and make loads of useful stuff.

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So, what are you up to here? We're planting sweet peas.

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Oh, brilliant, can you show me how to do it?

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First, you have to get a seed. Yeah.

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And then, you put your finger down. Make a big hole. Yeah.

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And then, you have to measure 15cm long

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and then, you put your seed in and then, you cover it.

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What do we do next? We put a brand new cloche onto it. Uh-huh.

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And what's the cloche made of?

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It's a recycled bottle that we collected and it's round.

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That's fantastic.

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So, you've stuck it over the top and the slugs can't get to it

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and it'll keep the plant nice and cosy. Yeah. Brilliant.

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Is that the coolest thing you can make out of recycling? Noooo!

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So, what are you up to here? Putting bird feeders up.

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And how've you made the bird feeder?

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We cut a shape out of the bottle and then put the bird food in.

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That looks absolutely brilliant. We can use it for different stuff.

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Excellent, well done, I think this looks great.

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Is this the coolest thing you can make out of recycling? Noooo!

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So, what is the coolest thing you can make out of recycled bottles?

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A greenhouse! Yeah!

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A greenhouse made from 1,500 plastic bottles.

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Now, that's brilliant.

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Did you know that maths can help us protect our planet?

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Maths can help us recycle old rubbish to make new things.

0:19:140:19:17

Maths can help us save energy in our homes and schools.

0:19:170:19:22

Maths can even help us grow our own food and much, much more.

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Hiya, I'm Stef, and I'm going to show you

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how you can help save energy and the planet, using maths.

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But this isn't any old maths, this is what I call Ecomaths,

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and it's a brilliant way to understand the world around us

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and to help make it a better place.

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Here at the Royal London Hospital, they look after lots of people

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and help them to get better quickly.

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In a place like this, you can discover lots of maths

0:19:580:20:00

and measurements going on all around you.

0:20:000:20:03

Have you ever had your temperature taken?

0:20:070:20:09

This girl has hers taken four times a day.

0:20:090:20:12

Before I find out about the maths,

0:20:120:20:14

I'm going to read a story to some of the children.

0:20:140:20:17

Once upon a time, there were three bears

0:20:190:20:21

and they lived in a house in the woods.

0:20:210:20:23

In the house, lived Daddy Bear, Mummy Bear and Baby Bear.

0:20:230:20:29

Daddy Bear made porridge, but it was too hot.

0:20:290:20:32

So, Mummy Bear, Daddy Bear and Baby Bear

0:20:320:20:35

went for a walk in the forest to let their porridge cool down,

0:20:350:20:38

when along came a little girl called...

0:20:380:20:42

Goldilocks.

0:20:420:20:43

Goldilocks, exactly.

0:20:430:20:45

Goldilocks went into the bear's house

0:20:450:20:48

and, on the table, were three bowls of...

0:20:480:20:52

Porridge. Porridge, exactly.

0:20:520:20:54

Goldilocks tried the first bowl of porridge,

0:20:540:20:57

but it was too cold. Eurgh!

0:20:570:21:00

So then, Goldilocks tried the second bowl of porridge.

0:21:000:21:04

Ooh! It was too hot!

0:21:040:21:08

Goldilocks tried the third bowl of porridge.

0:21:080:21:11

Oooh-ho-ho! It was just right.

0:21:110:21:15

Not too hot, not too cold, but just right.

0:21:150:21:21

So, Goldilocks gobbled it all up. Yum, yum.

0:21:210:21:26

So, Goldilocks had a problem.

0:21:280:21:29

Three bowls of porridge, but she didn't know which one to eat.

0:21:290:21:32

Which would be too hot? Which would be too cold?

0:21:320:21:35

Which would be just right?

0:21:350:21:36

The thing is, I'm lucky because I've got one of these.

0:21:360:21:40

It's a thermometer

0:21:400:21:41

and the thermometer will tell me the temperature of the porridge.

0:21:410:21:44

I've got one over on Goldilocks.

0:21:440:21:46

So, porridge number one is...

0:21:460:21:49

15 degrees. Eurgh! That's way too cold, it'd be disgusting.

0:21:490:21:55

One in the middle.

0:21:550:21:56

That is... Ah! ..70 degrees.

0:21:560:21:59

That would take your tongue off.

0:21:590:22:01

Way, way too hot.

0:22:010:22:03

Let's try the last one.

0:22:040:22:05

Ah-ha-ha!

0:22:060:22:08

That is 40 degrees,

0:22:080:22:11

exactly how I like it. I'm going to eat it.

0:22:110:22:14

We measure the temperature of porridge to see if it's just right

0:22:140:22:18

and good to eat.

0:22:180:22:19

We measure the temperature of people to check if they're well.

0:22:190:22:24

How about the room?

0:22:240:22:25

Jenny, why is it so important to control the temperature in the ward?

0:22:250:22:28

By keeping the temperature at a normal level,

0:22:280:22:31

it helps the patient to recover quicker.

0:22:310:22:33

The radiators are on a lot of the time

0:22:330:22:35

and there's no way to turn them down.

0:22:350:22:37

The only way to cool the room down

0:22:370:22:38

is to turn the air conditioning on or open the window.

0:22:380:22:41

The heat's on quite high all the time. Yeah.

0:22:410:22:43

And you're opening the window, to let the heat out. Yeah.

0:22:430:22:46

It's quite a strange thing to do, isn't it?

0:22:460:22:48

You're letting the energy nip out the window. Escape, yeah.

0:22:480:22:51

They're building a new hospital next door.

0:22:510:22:54

I wonder how they'll control the temperature.

0:22:540:22:57

This is Fiona.

0:22:570:22:58

Now, it just seems crazy to me that, in order to control the temperature

0:22:580:23:02

in the ward, you have to open the windows.

0:23:020:23:05

Isn't that a waste of energy? Absolutely.

0:23:050:23:07

It's a huge waste of energy.

0:23:070:23:08

And that's one of the reasons why we've built the new hospital,

0:23:080:23:12

because it's far more energy efficient.

0:23:120:23:15

They spend ?5 million on heating this hospital, every year,

0:23:150:23:20

so they need to save energy wherever they can.

0:23:200:23:23

So, how do you heat a building as huge as this hospital?

0:23:250:23:29

So, this is the main boiler house. Wow!

0:23:290:23:32

And we have six big boilers in here. So, they're heating the air

0:23:320:23:37

that's coming in from the outside and putting it into the hospital.

0:23:370:23:40

And then, before we send it out the other side of the building,

0:23:400:23:43

we don't just open the window and let it all go into the atmosphere.

0:23:430:23:47

We take the energy and the heat that we can

0:23:470:23:49

and we send it back through these pipes and back into the system,

0:23:490:23:52

so we don't have to heat it up again, so we don't waste any energy.

0:23:520:23:56

So, this is the control room. Yep.

0:24:010:24:04

Basically, there's a lot of thermometers around

0:24:040:24:07

and every room has a temperature thermometer

0:24:070:24:10

and then we measure it and monitor it here.

0:24:100:24:13

Can you change the temperature from the computer room?

0:24:130:24:16

Yes, you can go into any room

0:24:160:24:17

and you can turn the temperature up or down in any room.

0:24:170:24:20

So, you can control a room right on the other side of the hospital,

0:24:200:24:24

here, in this very room? Right from here.

0:24:240:24:26

So, why is it important that a room is not too hot, not too cold,

0:24:260:24:29

but just right? OK, so, it's really important

0:24:290:24:32

because, obviously, we need to make sure

0:24:320:24:34

that the children aren't too hot or too cold when they're in hospital

0:24:340:24:37

and, also, we need to make sure that we're not wasting any energy.

0:24:370:24:40

And turning down just one degree can make a huge, huge difference.

0:24:400:24:44

So, this is the new hospital.

0:24:440:24:47

This is where all the children will be moving into.

0:24:470:24:49

And you can feel the temperature.

0:24:490:24:51

The temperature in the old hospital... Was really hot.

0:24:510:24:54

..really hot. This is kind of perfect, isn't it? Yeah.

0:24:540:24:57

There's a few things that we've got in here,

0:24:580:25:00

these windows, don't open at all.

0:25:000:25:02

They're completely sealed, so you can't open them. Why's that?

0:25:020:25:05

So no energy can escape, so we can control the temperature really well

0:25:050:25:09

within the building.

0:25:090:25:10

Then, on the outside, here, we've got these solar deflectors.

0:25:100:25:13

They stop the sun coming in, during the summer,

0:25:130:25:17

and heating the building up. So, these deflect the sun.

0:25:170:25:20

Bounces off the building completely.

0:25:200:25:22

So the building stays really nice and cool.

0:25:220:25:24

And if you were a little bit too hot, a little bit too cold,

0:25:240:25:28

can you still control the temperature in here?

0:25:280:25:30

Yeah, you control it a little bit

0:25:300:25:32

and we can show you that over here, on the thermostat.

0:25:320:25:35

So, they can turn it up or down by one degree

0:25:370:25:40

if they're too hot or too cold in the room.

0:25:400:25:43

The rest of it is all controlled

0:25:430:25:44

by the main control panel downstairs? Yes. That's genius.

0:25:440:25:47

I've come to this Eco-School in Bristol

0:25:520:25:55

to meet some really cool kids. And the reason they're cool

0:25:550:25:58

is cos they're taking the temperature of this place

0:25:580:26:00

into their own hands

0:26:000:26:01

and, that way, they're going to save energy.

0:26:010:26:03

All you need to save energy

0:26:030:26:06

is something to measure the temperature

0:26:060:26:08

and a way of recording it. Oh, and some pupil power.

0:26:080:26:11

This is a temperature thermometer

0:26:150:26:19

and it tells you if we're wasting lots of energy.

0:26:190:26:22

And so, what does this one tell us?

0:26:220:26:24

It's 21. 21.

0:26:240:26:26

25.

0:26:320:26:33

So, what've we got here?

0:26:340:26:35

The temperature here is 19, which is very good for us.

0:26:350:26:39

That's much better, isn't it?

0:26:390:26:41

So, that's really good, isn't it?

0:26:410:26:43

19 is pretty nearly ideal temperature. Yeah. OK.

0:26:430:26:46

Wow. So, what's this room? The staff room.

0:26:460:26:50

The staff room. Are you guys allowed in the staff room?

0:26:500:26:53

No. Ha-ha.

0:26:530:26:54

Let's see what kind of temperature they have it here. 23.

0:26:540:26:58

23!

0:26:580:26:59

That's amazing. There's some real surprises,

0:27:070:27:10

but, unless you look at the thermometers, you would never know.

0:27:100:27:14

It's all very well collecting numbers,

0:27:140:27:16

but what do you do with them?

0:27:160:27:18

Well, that's where the maths kicks in.

0:27:180:27:20

Let's find out what's going on in here.

0:27:200:27:22

So, guys... So, Zane, can you show me what you're doing?

0:27:220:27:26

We're doing a bar chart. Uh-huh.

0:27:260:27:29

So, Lola, what can you tell me about the bar chart?

0:27:290:27:32

That it's telling us which classes save the most energy.

0:27:320:27:37

And what have you learnt?

0:27:370:27:39

That the class that hasn't been saving the most energy is Holly

0:27:390:27:45

and the one that saves the most is Beech.

0:27:450:27:48

The highest bar means when it's really, really hot.

0:27:480:27:52

And the lowest bar means it's really, really cold.

0:27:520:27:57

Cool.

0:27:570:27:58

These are some of the best bar charts I've ever seen.

0:27:580:28:02

These cool kids are making a huge chart in the hall.

0:28:100:28:13

They've used a pink ribbon to show the ideal temperature,

0:28:220:28:26

at 18 degrees.

0:28:260:28:27

You can see that most of the classes could save more energy

0:28:300:28:34

and only Beech class is really cool and wins the energy saving contest.

0:28:340:28:40

The brilliant thing about this eco-project

0:28:410:28:44

is that it makes everything so clear.

0:28:440:28:46

All of these temperatures are just a mess of wasted energy,

0:28:460:28:50

until you use maths to really understand it.

0:28:500:28:52

And then, you can get a big picture like this

0:28:520:28:55

and you can begin to make a difference.

0:28:550:28:57

Did you know that maths can help us protect our planet?

0:29:030:29:07

Maths can help us recycle old rubbish to make new things.

0:29:070:29:11

Maths can help us save energy in our homes and schools.

0:29:110:29:15

Maths can even help us grow our own food and much, much more.

0:29:150:29:21

Hiya, I'm Stef, and I've come here to one of the biggest greenhouses

0:29:280:29:32

in Britain to find out how they use maths to water the plants.

0:29:320:29:37

This is what they're growing in here.

0:29:540:29:56

Cucumbers. It's one of my favourite veg.

0:29:560:29:58

And why are they growing them in a greenhouse?

0:29:580:30:01

Well, it's freezing cold out there.

0:30:010:30:03

And there's two things that you need to grow cucumbers with,

0:30:030:30:06

warmth and a heck of a lot of water.

0:30:060:30:09

Now, this place is enormous,

0:30:090:30:11

but I need to find somebody who can tell me all about it.

0:30:110:30:15

Hi Judy, how you doing? Hello.

0:30:150:30:17

Tell me about this extraordinary place.

0:30:170:30:20

This is the biggest, most environmentally-friendly

0:30:200:30:22

cucumber greenhouse in the United Kingdom.

0:30:220:30:25

It's vast, isn't it? I think if you grew food on the moon,

0:30:250:30:28

you'd probably do it a bit like this, wouldn't you?

0:30:280:30:31

What do you need to grow cucumbers?

0:30:310:30:33

You need warmth, you need water

0:30:330:30:36

and, of course, you need some food as well.

0:30:360:30:38

I can't see anyone with a watering can,

0:30:380:30:40

how do you water the plants?

0:30:400:30:41

We have a big, computer-controlled system

0:30:410:30:44

that waters the plants for us.

0:30:440:30:45

A cucumber is mainly water. It's about 96% water.

0:30:450:30:49

To grow one, it takes about four litres of water.

0:30:490:30:52

The computer-controlled system puts this water and nutrient mix

0:30:520:30:55

through this dropper, and that dropper is water and nutrients.

0:30:550:30:59

Anything that the plant doesn't absorb,

0:30:590:31:01

we catch in these little trays at the side, here, and we recycle that.

0:31:010:31:05

About 30% of the water that we use everyday

0:31:050:31:07

is recycled from the previous day.

0:31:070:31:09

That is genius. Where does the water here come from?

0:31:090:31:12

We capture the water on the roof of the greenhouse

0:31:120:31:15

and we keep that in a reservoir outside.

0:31:150:31:18

And why do you collect rainwater, why not just turn a tap on?

0:31:180:31:20

Why do you need to collect it? Tap water's been treated.

0:31:200:31:23

Our plants, they just need untreated water. They just need the rain.

0:31:230:31:26

It's cheap, it's there, it seems crazy not to use it.

0:31:260:31:29

Yeah, it's free. It's free! We've got a really big roof,

0:31:290:31:32

so, instead of just letting the water fall off it into the ground,

0:31:320:31:35

we capture all that water and we use it to build strong, healthy plants.

0:31:350:31:39

More than a billion people on the planet have no access

0:31:440:31:48

to clean drinking water, yet, we take it for granted,

0:31:480:31:52

even using it to wash our cars and water our gardens.

0:31:520:31:55

So, rainwater could be an alternative.

0:31:550:31:58

You've got to have a roof to collect it and somewhere to store it.

0:31:580:32:03

And that's where the maths comes in.

0:32:030:32:06

Let's start with something we all know, a litre-bottle of water,

0:32:060:32:09

but a litre can come in lots of different shapes.

0:32:090:32:12

Take a look at this.

0:32:120:32:13

I'm going to pour my litre into a big cylinder,

0:32:130:32:18

goes into there.

0:32:180:32:20

I'm going to try putting it into a square container.

0:32:230:32:28

There we go. Again, same litre of water

0:32:290:32:32

and it's in a container that's 10cm by 10cm by 10cm.

0:32:320:32:39

It's exactly a litre. Now, take a look at this.

0:32:390:32:43

A litre of water can also be in the shape of a puddle.

0:32:430:32:47

Now, I've got a frame here that's exactly one metre

0:32:470:32:51

by one metre square.

0:32:510:32:52

And I've got four litres already poured into it.

0:32:520:32:57

I'm going to add one more litre of water

0:32:570:33:00

and, if I've got my maths right,

0:33:000:33:04

this should be 5mm high.

0:33:040:33:08

5mm, so I know that this is exactly five litres.

0:33:100:33:15

So, a litre of water comes in many shapes.

0:33:150:33:19

In the metre square frame, it's a puddle, 1mm deep.

0:33:190:33:23

So, five litres is a puddle 5mm deep.

0:33:230:33:26

Put another way, for every millimetre of rain that falls

0:33:260:33:29

on a square metre of roof, you get one litre of water.

0:33:290:33:34

I want to work out how much water I can get

0:33:340:33:37

from this whole, massive roof.

0:33:370:33:39

So, I need to work out the surface area in square metres

0:33:390:33:43

and then, multiply that by the rainfall in millimetres.

0:33:430:33:47

First of all, I've got to measure it. Give us a minute.

0:33:470:33:51

So, that was...

0:34:000:34:01

It's about thir...

0:34:010:34:02

Oh, got to do it again.

0:34:040:34:07

I found out that the area is an incredible 61,000 square metres.

0:34:080:34:13

Not by pacing it out, but by asking an expert.

0:34:130:34:17

This is Rob. So, Rob, how do you go about harvesting rainwater?

0:34:170:34:21

It sounds like a really odd idea.

0:34:210:34:23

It's a big word for a very simple thing.

0:34:230:34:25

Basically, we're collecting all the rain that lands on the roof

0:34:250:34:28

of this big greenhouse. How much water do you use in a year?

0:34:280:34:31

We use around about 70 million litres of water. Wow.

0:34:310:34:37

That's a lot of cucumber. That's a lot of cucumber,

0:34:370:34:39

but, again, that's over an area, of 61,000 square metres.

0:34:390:34:43

And how much of that water that you use

0:34:430:34:46

is rainwater that you've collected?

0:34:460:34:48

It depends how much rain we get each year,

0:34:480:34:50

but we would say, on average, around 35 million litres, so around half.

0:34:500:34:55

Nearly half of it, literally, just falls on your roof.

0:34:550:34:58

That is amazing, isn't it?

0:34:580:35:00

Conserving water is massively important

0:35:120:35:15

because, every time you turn on the tap,

0:35:150:35:17

the water that comes out has been purified,

0:35:170:35:19

it's been piped for miles around the country

0:35:190:35:21

and it's used a heck of a lot of energy in the process.

0:35:210:35:24

So, we shouldn't waste water

0:35:240:35:26

on things that don't need it to be pure.

0:35:260:35:28

Things like washing your car or flushing the loo or watering plants.

0:35:280:35:32

Now, this place is amazing.

0:35:320:35:35

But you don't need acres and acres of glass

0:35:350:35:39

and super hi-tech, computer-controlled kit

0:35:390:35:41

to harvest rainwater.

0:35:410:35:43

I'm going to meet some people who have a much simpler idea.

0:35:430:35:46

This is Peatmoor Primary School near Swindon,

0:35:490:35:52

where they have lots of roofs and lots of rain.

0:35:520:35:55

850mm per year.

0:35:550:35:58

Hi, guys. So, what are you up to here?

0:35:580:36:01

Well, we're doing a rain harvesting project. And how does that work?

0:36:010:36:05

When it rains, it falls onto the top of the shed,

0:36:050:36:08

it trickles into the gutter,

0:36:080:36:10

there's a tube down here to land into the watering butt.

0:36:100:36:13

So, how do you work out

0:36:130:36:15

how much water you're going to get from this roof?

0:36:150:36:17

First, we get the length times the width

0:36:170:36:19

and then, we times it by the average rainfall, that's 85cm a year.

0:36:190:36:23

While you measure how much water you're going to get,

0:36:230:36:26

can you show me where you use the water?

0:36:260:36:28

At the school, they have a massive eco-garden.

0:36:280:36:32

So it's a bit like an outdoor classroom?

0:36:320:36:34

While some of the children finish off the measuring,

0:36:340:36:37

I take a look around.

0:36:370:36:39

But it's huge.

0:36:390:36:40

How much water do you reckon you're going to need to water it?

0:36:400:36:43

Lots. Masses, aren't you?

0:36:430:36:45

So, can they collect enough rainwater from the shed roof

0:36:450:36:48

to water the garden?

0:36:480:36:50

How much can they harvest in a year?

0:36:500:36:52

Let's go find out how you're mates are doing.

0:36:520:36:54

How you getting on working out how much water there is?

0:36:540:36:57

Good, we just got the answer. It's almost 7,000 litres.

0:36:570:36:59

Wow. So, how did you work it out?

0:36:590:37:02

We've taken the width and the length and we've times it together.

0:37:020:37:05

1.91 metres and 4.28 metres.

0:37:050:37:10

We times that together to get 8.2metres squared.

0:37:100:37:13

That's the area. That's the area.

0:37:130:37:15

Then, we times that by the average rainfall, that is 850mm.

0:37:150:37:21

That got us to about 7,000 litres. Nearly 7,000 litres.

0:37:210:37:25

You can get a lot of water from one shed, can't you? Yeah.

0:37:250:37:28

That's not a big shed, it's a lot of water.

0:37:280:37:30

But, do you reckon it's enough water for the garden? No.

0:37:300:37:33

No, it's nowhere near enough water for the garden

0:37:330:37:35

for the whole year to grow all the vegetables.

0:37:350:37:37

So, what are we going to do if we need more water?

0:37:370:37:40

Well, we could always try a much bigger roof.

0:37:400:37:43

OK, so, we're going to do the whole thing. Put your arms up in the air.

0:37:430:37:47

The whole thing! OK, ready, guys? And go!

0:37:470:37:49

Wind up the tape measures.

0:37:490:37:51

OK, and back over here.

0:37:510:37:53

That is a nightmare, has anyone got a better idea? Yeah!

0:37:550:37:58

All right, show us.

0:37:580:37:59

Ah-ha! So, what is this?

0:38:030:38:06

It's the plan of the school.

0:38:060:38:08

Brilliant. We don't need to measure outside,

0:38:080:38:10

we can take it from here? Yeah.

0:38:100:38:11

Fantastic. OK. So, that's the roof that we were just trying to measure.

0:38:110:38:16

How do we measure it?

0:38:160:38:17

The scale is one to 100, so 1cm equals a metre.

0:38:170:38:21

16cm.

0:38:210:38:23

16cm equals how many metres? 16 metres.

0:38:230:38:26

So, the roof is 430 square metres?

0:38:260:38:29

430 times by 850.

0:38:290:38:32

So, what's the final figure? 365,500 litres.

0:38:320:38:37

365... Is that a big number? Yeah!

0:38:370:38:40

That's a whopper, isn't it?

0:38:400:38:42

What do you think you could do with that water?

0:38:420:38:44

Well, it could water the whole garden

0:38:440:38:46

and it can run the toilets for a whole year.

0:38:460:38:48

It could do the whole school, couldn't it?

0:38:480:38:50

You guys are brilliant, thank you so much.

0:38:500:38:53

The brilliant thing about rainwater harvesting

0:38:560:38:59

is that it doesn't need to be done on a massive scale.

0:38:590:39:02

When you do the maths, you realise

0:39:020:39:04

that even a small roof can get a huge amount of water.

0:39:040:39:08

Why don't you try it on a roof near you?

0:39:080:39:10

Did you know that maths can help us protect our planet?

0:39:130:39:18

Maths can help us recycle old rubbish to make new things.

0:39:180:39:23

Maths can help us save energy in our homes and schools.

0:39:230:39:26

Maths can even help us grow our own food and much, much more.

0:39:260:39:31

Hiya, I'm Stef,

0:39:380:39:40

and I'm going to show you how you can help save the world using maths.

0:39:400:39:44

I know that sounds a bit weird, but this is Ecomaths,

0:39:440:39:47

and it's a brilliant way of using maths in the real world

0:39:470:39:50

to help make it a better place.

0:39:500:39:51

Watch this. Taxi!

0:39:510:39:53

Hi, there. Station, please? Yeah.

0:39:550:39:57

I want to look at cars.

0:40:030:40:05

We all know that they use up precious energy,

0:40:050:40:07

they cause pollution and are bad for the environment,

0:40:070:40:10

but we like them because they're convenient and they're cosy,

0:40:100:40:14

and most importantly, we think that they're pretty fast.

0:40:140:40:17

But I want to know if that's really true,

0:40:180:40:20

so I'm timing how long it's going to take me

0:40:200:40:23

to get to the centre of Bristol in this taxi.

0:40:230:40:26

Going pretty fast actually!

0:40:310:40:33

Oh, we're here.

0:40:330:40:35

13 mins 57 secs.

0:40:420:40:46

Not bad.

0:40:460:40:47

I'm back where I started,

0:40:490:40:50

I'm going to make exactly the same trip again but in a different way.

0:40:500:40:54

There you go. Thank you. Hop on.

0:40:540:40:57

I'd never ridden a rickshaw, but here goes.

0:40:570:41:00

Off to the station again.

0:41:000:41:02

Looks like I'm pedalling and Ian's my passenger.

0:41:020:41:06

He knows about reducing car use and saving CO2 by going by bike.

0:41:060:41:14

This is the Bristol to Bath path.

0:41:140:41:17

This is the oldest cycle path in the country?

0:41:170:41:19

That's right.

0:41:190:41:20

It's looking good, isn't it? I though it'd be full of footholes.

0:41:200:41:23

Well they look after it really well and that way is Bath

0:41:230:41:26

and this way where we're going is Bristol.

0:41:260:41:29

Do that many people use it every year?

0:41:290:41:31

You'd be surprised.

0:41:310:41:32

This is one of the busiest in the country.

0:41:320:41:34

On a nice summer's day, 3,000 people will cycle down it just on that day.

0:41:340:41:46

but being in cars, then we'd have a huge traffic problem.

0:41:460:41:49

So it's relieving the roads in this whole area.

0:41:490:41:52

Just down there, I can see a little traffic jam, kinda think, ha ha!

0:41:520:41:57

Neeooow!

0:41:570:41:59

I suppose building cycle paths like this,

0:41:590:42:02

that comes with its own cost and problems, doesn't it?

0:42:020:42:06

Certainly, there are materials used there's time and energy

0:42:060:42:10

embedded in actually making these paths.

0:42:100:42:13

We've got to persuade people to make that change

0:42:130:42:18

from car use to walking and cycling

0:42:180:42:20

to be able to pay off the carbon embedded in the path.

0:42:200:42:23

Cycle paths are a great way to encourage people to cycle

0:42:230:42:27

instead of drive, but to build them we have to use machines

0:42:270:42:31

and materials that use energy and produce carbon dioxide.

0:42:310:42:34

Time to hop off the rickshaw and talk to Francis,

0:42:340:42:38

project manager of Bristol's latest cycleway.

0:42:380:42:41

So what's the carbon cost of building this cyclepath?

0:42:410:42:44

For this particular path, which is one kilometre long,

0:42:440:42:48

it's about 115,000 kilograms of CO2.

0:42:480:42:52

These workmen back here will be using carbon

0:42:520:42:55

in building the thing?

0:42:550:42:56

That's right and the specialised machinery they'd use

0:42:560:43:00

to build the path.

0:43:000:43:01

How do you work out how you save carbon? How do you do the maths?

0:43:010:43:03

For each person who converts from a car journey to a cycle journey,

0:43:030:43:08

we save 0.17 kg of CO2.

0:43:080:43:12

We calculate how many trips people make on a path like this per day.

0:43:120:43:17

So, we're estimating it'll be between 500 and 2,000 trips per day.

0:43:170:43:23

That's brilliant.

0:43:230:43:24

I never knew it was so fascinating that there are numbers

0:43:240:43:27

sitting in the cycle path.

0:43:270:43:29

I can't wait to have a go on it.

0:43:290:43:31

Take care! Time to do the maths.

0:43:310:43:33

We need to work out how much carbon we have to save

0:43:330:43:36

to pay back the carbon cost of building the new cycle path.

0:43:360:43:40

First of all, what's the difference between a bike and a car?

0:43:400:43:44

Well the difference of a kilometre by car

0:43:440:43:47

and a kilometre by bike, is a saving of 0.17 kg of CO2.

0:43:470:43:52

Brilliant.

0:43:520:43:53

OK and how many trips?

0:43:550:43:58

There's an average of about 500 trips per day.

0:43:580:44:01

500 a day? OK.

0:44:010:44:03

We should be able to work out how much carbon we save everyday

0:44:050:44:10

and how much is that then?

0:44:100:44:12

It's 500 times 0.17 which equals 85 kg of CO2.

0:44:120:44:19

OK, so over a year?

0:44:190:44:21

Well 85 kg of carbon per day

0:44:210:44:24

would equal 31,000 kg of C02 over a year.

0:44:240:44:29

Wow, OK.

0:44:290:44:30

At 31,000 kg of c02 per year, after four years,

0:44:300:44:34

they'll have saved over 115,000 kg of C02,

0:44:340:44:40

the original carbon cost of the cycle way.

0:44:400:44:43

After four years, what happens then?

0:44:430:44:45

Then you've broken even and then you're into carbon saving.

0:44:450:44:48

Almost at the station now, not really faster than a taxi,

0:44:590:45:02

with all the stopovers, but far healthier.

0:45:020:45:05

Yes, we're there! We're here!

0:45:050:45:09

Brilliant!

0:45:090:45:10

Thank you for driving me here.

0:45:100:45:12

That's a great pleasure. That was brilliant!

0:45:120:45:16

I'm not sure if that was actually any faster,

0:45:160:45:19

but it was brilliant, I've had a great time.

0:45:190:45:22

It makes you feel good about the day.

0:45:220:45:24

Brilliant, glad you enjoyed it. Thank you very much, take care.

0:45:240:45:28

Are people changing their ways and leaving their cars behind?

0:45:340:45:37

Until we do the math, we don't know!

0:45:370:45:39

Which is why I've come to Chester Park Primary School.

0:45:390:45:43

Ian has organised a free bikers breakfast this morning,

0:45:430:45:47

to encourage the pupils to cycle to school.

0:45:470:45:50

But has it worked?

0:45:500:45:52

I'm joining some pupils to collect the data.

0:45:520:45:54

Ethan, how'd you get to school?

0:45:540:45:58

I walked to school today. Thank you.

0:45:580:46:00

Tianna, how did you get to school? I drove today, Manny, so it's a car.

0:46:000:46:04

Thank you. Ben, how'd you get to school? Walked.

0:46:040:46:07

I cycled to school.

0:46:070:46:09

I walked. Drove. In a car. Walking. Thank you.

0:46:090:46:13

They collect the data sheets from every class in the school,

0:46:130:46:16

and then the maths kicks in.

0:46:160:46:18

5, 6, 7, 8, 9, 10, 11, 12, 13, 14.

0:46:180:46:25

Totals?

0:46:250:46:27

My grand total is 234.

0:46:270:46:29

Have you got 12 for car or van? Yes.

0:46:290:46:32

Guys, can you tell me what you're up to?

0:46:320:46:33

What we're doing is somebody asked us

0:46:350:46:38

how people come to school.

0:46:380:46:39

We will get the data, then we'll go and put it into a spreadsheet.

0:46:390:46:44

How have you worked out

0:46:440:46:45

the percentage of people that came by bike?

0:46:450:46:48

Divide that number, which is 36, by 239,

0:46:480:46:53

the number of people who are present in school today,

0:46:530:46:57

and then times it by 100 which would give us the percentage.

0:46:570:47:01

Scooter. 14 divided by 237.

0:47:010:47:08

Times that by 100 and you get your answer. 5.90.

0:47:080:47:12

So, scooter's pretty high! That's not bad.

0:47:130:47:16

Brilliant guys, OK, so what have you come up with?

0:47:160:47:18

I've done a bar chart showing how many people from each class,

0:47:180:47:24

how they came to school.

0:47:240:47:27

What can you see? Which class do think has done best?

0:47:270:47:30

I think it's probably 5C because they've got right to the top,

0:47:300:47:36

so that's 18, with walking and scooter.

0:47:360:47:38

Car and van, I would've thought would've been a bit lower.

0:47:380:47:42

Why do you think that is? Maybe cos of the temperature.

0:47:420:47:46

It's quite cold today, isn't it?

0:47:460:47:48

Maybe a few people more than usual came by car.

0:47:480:47:51

That's brilliant, well done.

0:47:510:47:53

Next, they use information from Bristol City Council

0:47:530:47:56

to compare today's total with the average for last year

0:47:560:48:00

in terms of carbon emissions.

0:48:000:48:02

We were trying to find out the change between last year's C02

0:48:020:48:06

emitted per pupil to this year's C02 per pupil.

0:48:060:48:10

The figure from last years 2010-11 C02 per pupil was 45.38 kg emitted.

0:48:100:48:18

Today's C02 per pupil was 42.2 kg, the difference was 3.18 kg.

0:48:200:48:27

A 7% decrease since last year.

0:48:270:48:30

So why do you think there's a 7% difference?

0:48:300:48:33

Because there's been a new year group come in and one leave.

0:48:330:48:37

Maybe more people walk or cycle to school in the year three group

0:48:370:48:42

than people drove to school in the year six group last year.

0:48:420:48:47

Today we had a Bike It Breakfast, lots more people will cycle

0:48:470:48:50

because they want to have a free breakfast.

0:48:500:48:53

Looks like Ian's Bikers Breakfast, may be working.

0:48:530:48:58

So, now for the fun stuff!

0:48:580:49:00

It's time to join Ian and the pupils for a bike ride.

0:49:000:49:04

In the end, it's safe, it's fast and it's fun to leave the car at home.

0:49:040:49:08

Let's go!

0:49:080:49:10

Did you know that maths can help us protect our planet?

0:49:180:49:23

Maths can help us recycle old rubbish to make new things,

0:49:230:49:27

Maths can help us save energy in our homes and schools,

0:49:270:49:32

maths can even help us grow our own food and much much more.

0:49:320:49:36

Hi, I'm Stef and I love my food but sometimes I've just had enough.

0:49:420:49:47

Now that waste ends up going to landfill

0:49:480:49:52

which is basically a huge hole in the ground.

0:49:520:49:55

What's the problem with that?

0:49:550:49:56

7.2 million tonnes, that's the problem.

0:49:560:50:00

That's how much food and drink we through away in the UK in a year.

0:50:000:50:04

I met up with Pamela from Wastewatch for a picnic lunch in the park.

0:50:050:50:10

How do we end up throwing away so much food in our homes?

0:50:100:50:13

There's two main reasons.

0:50:130:50:15

The first is that people perhaps buy too much,

0:50:150:50:18

or food has gone off before we've a chance to eat it.

0:50:180:50:22

Or stuff is... you've opened it and used it

0:50:220:50:24

but you haven't used it all by the time the use by or expiry date goes.

0:50:240:50:28

Second one, is where you've perhaps cooked too much food

0:50:280:50:31

or served too much food.

0:50:310:50:33

It's your plate scrapings or it's perhaps the leftover pasta or rice

0:50:330:50:37

which are big problems that end up going in the bin.

0:50:370:50:41

How much of the food produced actually ends up in our mouths

0:50:430:50:47

and how much gets chucked away?

0:50:470:50:49

To explain, I have a pie.

0:50:490:50:52

I'm going to turn this pie into a real life pie chart.

0:50:520:50:56

The whole pie represents all of the food that we could consume.

0:50:560:51:00

Here are the slices.

0:51:000:51:02

This first slice, around 7%, represents unavoidable food waste.

0:51:070:51:13

Things like banana skins and egg shells

0:51:130:51:16

that you have to throw away cos you can't eat them.

0:51:160:51:19

This next slice is about 10 %

0:51:190:51:22

and this represents avoidable food waste in our homes.

0:51:220:51:26

Food that's thrown away before it is cooked or after it's cooked.

0:51:260:51:29

Maybe you've bought too much food and it's gone mouldy,

0:51:290:51:32

you've taken too much on your plate

0:51:320:51:34

and you've had to scrape it into the bin.

0:51:340:51:37

This next piece is nearly as big, at 9%

0:51:370:51:40

and that's the waste from the supply chain.

0:51:400:51:42

That's 3.6 million tonnes.

0:51:440:51:47

Out of our whole pie, 26% of it is wasted.

0:51:480:51:52

That's more than a quarter. Why does it matter?

0:51:520:51:57

When food rots down, it produces methane

0:51:570:51:59

which is a really powerful greenhouse gas.

0:51:590:52:02

But as well as this, it is also a real waste of time,

0:52:020:52:06

of energy, of money, of resources, of water.

0:52:060:52:10

Avoidable food waste

0:52:100:52:12

is the equivalent of about 17 million tonnes of carbon dioxide

0:52:120:52:18

which is the same as if we took one of every five cars off the road.

0:52:180:52:21

Hang on a minute, have I got the ecomaths right?

0:52:210:52:25

Stopping food waste is the equivalent

0:52:250:52:28

to magicking one in five cars off the road.

0:52:280:52:31

Just imagine!

0:52:310:52:33

1, 2, 3, 4, gone!

0:52:330:52:39

1, 2, 3,

0:52:390:52:43

4,

0:52:430:52:46

gone!

0:52:460:52:48

1, 2, 3, 4, gone!

0:52:480:52:54

Now we know how much difference we could make

0:52:540:52:56

by reducing avoidable food waste in our homes.

0:52:560:53:00

The supply chain is everything that happens

0:53:000:53:03

before the food reaches us, and that's pretty wasteful too.

0:53:030:53:08

A big part of that is down to supermarkets.

0:53:080:53:10

I've come to this supermarket to find out

0:53:100:53:12

how food waste can be tackled using a little bit of thought,

0:53:120:53:15

a little bit of maths too.

0:53:150:53:18

This is Dan, who runs the fruit and veg.

0:53:200:53:23

In fruit and veg, we see three main ways that we tackle the waste issues.

0:53:260:53:30

Let's go with tomatoes.

0:53:300:53:31

We're heading over here.

0:53:310:53:33

What does Dan do if he finds a tomato that's not quite perfect?

0:53:330:53:38

Is it something you'd be happy taking home and eating?

0:53:380:53:41

Probably you'd be able to cook with it.

0:53:410:53:44

So, we head over this way.

0:53:440:53:45

We have a free box which customers can just help themselves.

0:53:450:53:49

We're not happy to charge them,

0:53:490:53:50

but we think it's worth taking home and doing something with it.

0:53:500:53:53

You pop it in the free box?

0:53:530:53:55

What we try to avoid is having things like that in the free box.

0:53:550:53:59

Much better home for this.

0:53:590:54:00

I don't think anyone's going to want to eat that. It looks a bit mouldy.

0:54:000:54:03

That's too far gone.

0:54:030:54:05

You'll find on here...

0:54:050:54:08

a big bag of compost.

0:54:080:54:11

So what happens to all of this? So, we've got a local producer

0:54:110:54:14

who grows a lot of salad leaves for us through the year.

0:54:140:54:17

They're two miles down the road and every time they deliver to us

0:54:170:54:20

they take these bags back with them.

0:54:200:54:23

One other things that we do

0:54:230:54:25

with vegetables that aren't quite fit to sell to the customers...

0:54:250:54:28

Nothing really wrong with these carrots,

0:54:280:54:31

they're just a bit dry, a bit sorry for themselves. But...

0:54:310:54:34

..what we have over here is the deli,

0:54:350:54:37

preparing fresh food for the public every day.

0:54:370:54:40

One giant pot of soup. So that's...

0:54:400:54:42

So that is heading that way.

0:54:420:54:43

It's a brilliant way to make use of something

0:54:430:54:46

that you've just got a few to many of.

0:54:460:54:47

If we're honest, to make money.

0:54:470:54:49

The public pay for nice soup. Brilliant. Now I'm hungry!

0:54:490:54:52

So, let's do the maths.

0:54:520:54:55

On average, they order 18 tonnes of fruit and veg per week.

0:54:550:54:58

About 97% is sold through the tills,

0:54:580:55:01

and 3% goes to the deli,

0:55:010:55:05

the free box, or to compost.

0:55:050:55:08

Is there a lot of number crunching involved?

0:55:080:55:12

To minimise waste, everything's got to be pretty accurate

0:55:120:55:15

and monitoring trends of how customers are buying.

0:55:150:55:18

The sunshine comes out, they buy strawberries. The sunshine goes in...

0:55:180:55:21

all of a sudden those strawberries are sitting there going nowhere.

0:55:210:55:25

So it's not just numbers, it's everything - the whole package.

0:55:250:55:28

By keeping the numbers really tight,

0:55:280:55:31

and judging what you'll sell,

0:55:310:55:32

you might get it wrong and sell out a little early,

0:55:320:55:35

but you're less likely to waste.

0:55:350:55:36

Remember, of the 18 tonnes of fruit and veg Dan orders a week,

0:55:360:55:41

around 3% is not sold.

0:55:410:55:43

That's 540 kilograms, or more than half a tonne of food,

0:55:430:55:46

that's not wasted and doesn't end up in landfill.

0:55:460:55:49

Good job, Dan!

0:55:490:55:51

I've found out masses about food waste so far,

0:55:510:55:54

but I know somewhere else where they are using eco maths

0:55:540:55:57

to help change our wasteful habits.

0:55:570:55:59

So here I am at Newton Ferrers School,

0:55:590:56:02

where they've got a team of food waste heroes

0:56:020:56:04

and they've been discovering some extraordinary things

0:56:040:56:07

about their school dinners.

0:56:070:56:09

The pupils are getting ready

0:56:090:56:11

to measure all the food waste and packaging this lunch time.

0:56:110:56:15

They've decided to compare school dinners and packed lunches.

0:56:150:56:21

Fantastic. So, I've got a sweet potato curry.

0:56:270:56:30

I can't believe there will be any food waste, it looks fantastic,

0:56:300:56:33

but we'll find out.

0:56:330:56:35

'The children who have packed lunches

0:56:350:56:38

'put their waste in the bins with the green labels.

0:56:380:56:41

'The school dinner waste goes into the grey bins.'

0:56:410:56:44

OK, so what do I do with this, then?

0:56:440:56:46

You take it over here to the...

0:56:460:56:48

OK, can you show me?

0:56:480:56:51

I feel really naughty doing that.

0:56:510:56:53

So, what's in there, quite a lot - a few flapjacks.

0:56:530:56:56

'Now it's time to do the weighing,

0:56:560:56:58

'and it's a messy business.

0:56:580:57:01

'All the school dinner waste has been poured into the green bucket.'

0:57:010:57:04

Lets keep the lid on that, that's disgusting.

0:57:040:57:07

6.28. 6.28. So what's in there? That's all the kitchen waste.

0:57:070:57:12

1.8 kilos, that's for the whole thing.

0:57:120:57:15

So that's all of the school dinners done,

0:57:150:57:16

now lets look at the packed lunch.

0:57:160:57:19

0.32. Brilliant.

0:57:190:57:22

This is all the data from this whole week

0:57:240:57:26

'Back in the classroom, they do the maths

0:57:260:57:29

'and calculate the total weight in each category.

0:57:290:57:32

'They need two pieces of information.

0:57:320:57:34

'Firstly, the weight of the empty boxes and bags.

0:57:340:57:37

'They did this before lunch. They also got the numbers of pupils

0:57:370:57:40

'having school dinners and packed lunches from the school office.

0:57:400:57:43

'Now they can work out the average per pupil.'

0:57:430:57:46

So, 5,920 divided by 71 school-dinner-eaters.

0:57:460:57:52

'The food waste from school dinners today

0:57:520:57:54

'was 83.4 grams per pupil,

0:57:540:57:57

'compared to...'

0:57:570:58:00

'..9.65 grams per pupil for packed lunches.'

0:58:030:58:06

So there's a big difference

0:58:060:58:07

between packed lunches and school dinners, isn't there?

0:58:070:58:11

'I've got a sneaking suspicion

0:58:110:58:12

'that some of the food waste from the packed lunches

0:58:120:58:15

'may be in bins at home.

0:58:150:58:16

'But for now,

0:58:160:58:17

'it looks like school dinners are more wasteful than packed lunches.'

0:58:170:58:20

So what do you do next? We need to make a graph.

0:58:200:58:23

'Finally, they prepare a pie chart,

0:58:230:58:25

'a bar chart, and a line graph

0:58:250:58:28

'to show changes in food waste

0:58:280:58:30

'for the four days of the food survey so far.'

0:58:300:58:33

It's great that this school is really trying to tackle

0:58:350:58:38

the amount of food waste that it creates.

0:58:380:58:41

But what's brilliant, is that they're using maths

0:58:410:58:43

to make sure that their campaign is based on real numbers.

0:58:430:58:46

Now, they're going to keep an eye on it over the next couple of months.

0:58:460:58:49

Will it be successful?

0:58:490:58:51

Well, only time and eco maths will tell.

0:58:510:58:54

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